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Engine · 1,595 questions

Electricity - USCG Exam Questions

Marine electrical systems: motors and generators, switchboards and distribution, batteries, electronics, and control engineering.

Every question below is a real U.S. Coast Guard exam question with four choices. Answer one and the correct choice is revealed instantly, with the USCG reference and illustration where the question uses one.

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All Electricity questions

Questions 901–1,000 of 1,595 · page 10 of 16

  1. #902 What is the name for the device shown in figure "A" of the illustration? Illustration EL-0064 illustration
  2. #903 An voltage amplifier has a calculated voltage gain of 5. Which statement is true concerning input and output voltages?
  3. #904 How are operational amplifiers, used primarily in analog circuits, characterized?
  4. #905 In referring to figure "E" of the illustration, what statement is true concerning the functional purpose of the coupling transformer? EL-0075 illustration
  5. #906 In referring to figure "F" of the illustration, what statement is true concerning the functional purpose of the RC coupling? EL-0075 illustration
  6. #907 In referring to the graphs shown in the illustration, which of the following figures represents a band pass filter? EL-0076 illustration
  7. #908 In referring to figure "A" of the illustration, what type of active filter circuit is shown? EL-0077 illustration
  8. #909 In referring to the frequency response filters shown in the illustration, what determines the band pass or band stop frequencies as appropriate? EL-00... illustration
  9. #910 As shown in the illustrated block diagram for a programmable logic controller system, in what functional component is the program developed and used t... illustration
  10. #911 As shown in figure "A" of the illustrated PLC sub-circuit, what type of circuit is depicted? EL-0230 illustration
  11. #912 As shown in figure "C" of the illustration, what type of timer is represented? EL-0242 illustration
  12. #913 As shown in figure "A" of the illustration, what input conditions are required to produce an output? EL-0241 illustration
  13. #914 As shown in all four diagrams included in the illustration, what type of logic circuit is represented? EL-0233 illustration
  14. #915 As shown in all four diagrams included in the illustration, what type of logic circuit is represented? EL-0227 illustration
  15. #916 As shown in all four diagrams included in the illustration, what type of logic circuit is represented? EL-0226 illustration
  16. #917 As shown in all four diagrams included in the illustration, what type of logic circuit is represented? EL-0234 illustration
  17. #918 As shown in all four diagrams included in the illustration, what type of logic circuit is represented? EL-0231 illustration
  18. #919 Referring to figure "1" of the illustration, what type of logic gate is symbolized? EL-0035 illustration
  19. #920 Referring to figure "2" of the illustration, what type of logic gate is symbolized? EL-0035 illustration
  20. #921 Referring to figure "3" of the illustration, what type of logic gate is symbolized? EL-0035 illustration
  21. #922 Referring to figure "4" of the illustration, what type of logic gate is symbolized? EL-0035 illustration
  22. #923 Referring to figure "5" of the illustration, what type of logic gate is symbolized? EL-0035 illustration
  23. #924 Which of the following is a disadvantage of electric drive propulsion systems?
  24. #925 Which statement is TRUE concerning electric propulsion drives?
  25. #926 An electric propulsion drive system in which the propulsion generator supplies power to both the propulsion motor and ship service loads is referred t...
  26. #927 What is one major advantage of a diesel electric propulsion plant?
  27. #928 Ships requiring rapid maneuvering response with a high degree of main propeller shaft control are most often what type of drive system?
  28. #929 Which of the listed temperature measuring devices installed on a large turbo-electric alternating current propulsion generator would be the most relia...
  29. #930 What is the operating function of a cycloconverter (CCV) as a static power converter used in electric propulsion motor drives?
  30. #931 What type of electric propulsion system converter is shown in the illustration? EL-0155 illustration
  31. #932 As shown in figure "A" of the illustration, the load-commutated inverter drive illustrated has how many pulses? EL-0159 illustration
  32. #933 The propulsion motor most often utilized in an ac drive system operating in the moderate to high power range is of what type?
  33. #934 As shown in figure "B" of the illustration, what statement is true concerning "regenerating" operation? EL-0162 illustration
  34. #935 How is the main shaft rotation on an AC diesel-electric propulsion vessel normally reversed?
  35. #936 As shown in the illustration, if the port propulsion motor field excitation circuit experienced a failure, what individual component failure would all... illustration
  36. #937 A shown in figure "A" of the illustrated propulsion motor variable speed drive, what statement is true? EL-0140 illustration
  37. #938 By what common means is the speed of the AC propulsion motor on a diesel-electric propulsion ship controlled?
  38. #939 While standing an "at sea watch" onboard an AC diesel-electric drive ship with a synchronous propulsion motor, you notice that the kwatt load is at ro...
  39. #940 What type of motor is generally used in DC propulsion drive systems?
  40. #941 How is the main propeller shaft rotation of a rectified DC diesel-electric drive normally reversed?
  41. #942 In a diesel electric plant, raising the generator's field excitation current will have what effect on the DC propulsion motor speed?
  42. #943 What equipment for modern SCR rectified DC propulsion drive systems is usually included in the package?
  43. #944 What statement is TRUE concerning the Azipod propulsion system?
  44. #945 Which of the following statement is TRUE concerning Azipod propulsion systems?
  45. #946 In an azipod propulsion system, how is three phase, frequency and voltage controlled power delivered to the synchronous propulsion motor stator windin...
  46. #947 In an azipod propulsion system, how is direct current delivered to the synchronous propulsion motor rotor for synchronous operation?
  47. #948 In an azipod propulsion system, how is the azipod unit itself rotated for the purposes of directing the thrust in accordance with steering commands fr...
  48. #949 For the purposes of high voltage marine practice, what is the threshold voltage where all voltages below this value are considered low voltage?
  49. #950 What is a disadvantage to the use of high voltage systems onboard ship?
  50. #951 What is the most common and reliable type of circuit breaker used for high voltage practice aboard ship?
  51. #952 Some shipboard high voltage systems have the neutral point of the generators bonded to the ship's hull with a neutral grounding resistor. What is the...
  52. #953 Suppose it is desired to determine the integrity of the insulation of a 4160 VAC motor. What type of insulation resistance tester (megger) would be su...
  53. #954 Before work may safely commence on a high voltage system, what must first be done after disconnection and isolation?
  54. #955 In order for a live-line tester to be used to test and prove dead a high voltage circuit, what must be done to verify the ability of the tester to det...
  55. #956 In addition to high voltage circuit grounding with ground-connecting switching devices, for additional operator safety and confidence, portable ground...
  56. #957 When completing repairs on a high voltage circuit where portable grounding straps were used for increased operator safety and confidence, what is the...
  57. #958 For a motor rated at 3.3 kV, what would be a minimum accepted insulation resistance to hull ground as tested by an appropriate megger (insulation test...
  58. #959 To facilitate communication between the wheelhouse and the steering gear room in a steering emergency where no external source of power is required, w...
  59. #960 Which station's emergency loudspeaker must allow for two-way communication?
  60. #961 Assuming the vessel has an engine control room, where is an engineers' assistance- needed alarm required to produce an audible signal?
  61. #962 In a typical fire detection control unit, what would be indicated by an illuminated blue light?
  62. #963 Which of the following fixed temperature heat-actuated fire detectors can be reused after it has detected a fire?
  63. #964 Which of the following fixed temperature heat-actuated fire detectors is the most prone to false alarms?
  64. #965 What shipboard system uses the synchronous transmission system?
  65. #966 The shaft revolution indicator system for a fixed pitch propeller has which of the following display capabilities?
  66. #967 A pyrometer indicating system such as that used for measuring diesel engine exhaust system temperatures uses what technology?
  67. #968 A bearing temperature monitoring system such as that used for measuring selected propulsion plant bearings uses what technology?
  68. #969 A salinity indicator system such as that used to measure the salt content of potable water systems and boiler feed and condensate systems uses what te...
  69. #970 On vessels with AC distribution systems, which of the following statements represents the most difficult problem involved in obtaining a DC potential...
  70. #971 What statement is true concerning read only memory (ROM)?
  71. #972 What statement is true concerning random access memory (RAM)?
  72. #973 Which of the following devices represents primary storage, where the processor is able to directly read instructions and data and directly return resu...
  73. #974 Which of the following data communication cable types offers the greatest immunity to electromagnetic "noise"?
  74. #975 What type of local area network physical topology features point-to-point interconnection between all communicating devices and is the least vulnerabl...
  75. #976 Modern ships use multiple computers arranged in a client/server network to perform various shipboard functions. What type of computer network would mo...
  76. #977 What Ethernet cabling technology supports the greatest data transfer speeds?
  77. #978 If an 8-bit digital to analog converter (DAC) produces an analog output voltage with a range of 10 volts (0-9 volts), what is the smallest incremental...
  78. #979 If a computer display is flickering, how may this be remedied?
  79. #980 As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the units labeled "ROS" which are rem... illustration
  80. #981 As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the workstations labeled "LOS" associ... illustration
  81. #982 As shown in the illustration, what statement is true concerning each of the system gateways? EL-0098 illustration
  82. #983 Concerning the illustrated fire detection and alarm system, when the system is operating normally and under supervision, what is the status of the gro... illustration
  83. #984 Referring to the illustration pertaining to an alternator protection and alarm system, what statement is true concerning the component labeled "LO"? E... illustration
  84. #985 Referring to the illustration pertaining to the semiautomatic navigation light panel circuit, if the buzzer sounds and the masthead indicator light co... illustration
  85. #986 In an impressed current cathodic hull protection system, what statement is true concerning the composition and arrangement of the anodes?
  86. #987 While monitoring an impressed current cathodic hull protection system, which of the following measurements should remain constant in a properly operat...
  87. #988 Referring to the impressed current cathodic hull protection system shown in the illustration, if required to control the impressed current to the anod... illustration
  88. #989 In monitoring an impressed current cathodic hull protection system, it is important to insure that the propeller screw receive the same cathodic prote...
  89. #990 Referring to the impressed current cathodic protection system shown in the illustration, if required to control the current to the anodes manually by... illustration
  90. #991 What statement is true concerning the 'MS 1' contacts of the master switch shown in the illustration? EL-0102 illustration
  91. #992 What is the functional purpose of the 'LSL' contacts for the hoist controller circuit shown in the illustration? EL-0102 illustration
  92. #993 In the event of a power failure during cargo loading operations, the movement of an electric powered cargo winch will be stopped by what means?
  93. #994 What is the functional purpose of the 'MS 2' contacts in the hoist controller circuit shown in the illustration? EL-0102 illustration
  94. #995 As shown in the illustration, how are the rotor windings of the motor configured? EL-0102 illustration
  95. #996 When the control handle is in the 'off' position, what is the status of the solenoid actuated brake of an electric winch?
  96. #997 What type of motor is used in the AC hoist controller as shown in the illustration? Illustration EL-0102 illustration
  97. #998 Which of the listed conditions occur when selection is made for 'third point hoist' on the winch hoist controller shown in the illustration? EL-0102 illustration
  98. #999 As shown in the illustration, what is responsible for maintaining the "UV" relay energized when the master switch handle is moved away from the "off"... illustration
  99. #1000 What is the name of the mechanism used to transmit rudder angle information from the steering gear itself to the wheelhouse in the illustrated rudder... illustration
  100. #1001 When power is restored after a complete power failure, how will the steering gear pump motor which was on-line respond?

Electricity questions: what to expect

Q How many Electricity questions are in the Engine pool?

There are 1,595 Electricity questions on this site, every one released by the U.S. Coast Guard or taken from the National Maritime Center's sample examinations, with its correct answer. The exam draws its Electricity module from the same pool.

Q What score do I need to pass the Electricity module?

Most USCG exam modules, including Electricity, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Electricity exam questions?

Yes. They are the published U.S. Coast Guard questions, matched to the National Maritime Center's 2026 sample examinations. Answer any question to see the correct choice, the USCG reference and the illustration where the question uses one.

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